人际沟通借助（ ）和（ ）两类符号，这两类符号往往被同时使用。二者可能一致，也可能矛盾。
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Fill in the blank with the appropriate form of the verb.1. He was low-spirited and even considered (go) away.
1. The goods _____________ when we arrived at the airport.
A. were just unloading
B. had just been unloading
C. had just unloaded
D. were just being unloaded
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